Ricks的回答当然很有帮助，但我想分享我的方法，即采用或扩展您的代码：

首先获取网络中选定博客的列表：

$args = array(\'site__in\' => array(2, 3, 6))
$sitesObj = get_sites($args);
$sites = object_to_array($sitesObj);

转换$sitesObj 对象到数组中：

$sites = object_to_array($sitesObj);

object_to_array($object) {
  if (!is_object($object) && !is_array($object)) {
    return $object;
  }
  return array_map(\'object_to_array\', (array) $object) ;
}

$postCounter = 0;
$maxPosts = 5; // total number of posts to show

foreach ($sites as $site) {
  switch_to_blog($site[\'blog_id\']);

  $args = array(
    \'post_type\' => \'post\', // or custom post type
    \'posts_per_page\' => 2, // number of posts per blog
    \'order\' => \'DESC\',
    \'orderby\' => \'date\' // you could also use \'rand\' here
  );

  $loop = new WP_Query($args);

  if ($loop->have_posts()) :
    while ($loop->have_posts() && $counter < $maxPosts) : $loop->the_post();
      // your output
    endwhile;
  endif;

  restore_current_blog();
}

This

function wolpostcount_shortcode($atts) {

  function object_to_array($object) {
    if (!is_object($object) && !is_array($object)) {
      return $object;
    }
    return array_map(\'object_to_array\', (array) $object) ;
  }

  $args = array(\'site__in\' => array(1,7,8,12,14,15,20,21,22,25,32,33,36,41,42,46,47,48,49));
  $sitesObj = get_sites($args);
  $sites = object_to_array($sitesObj);

  foreach ($sites as $site) {
    switch_to_blog($site[\'blog_id\']);

    $postcount = wp_count_posts(\'post\')->publish;
    $pagecount = wp_count_posts(\'page\')->publish;
     echo \'Posts:\'.$postcount.\' Pages:\'.$pagecount.\'<br>\';
    $totalpostcount = $totalpostcount + $postcount;
    $totalpagecount = $totalpagecount + $pagecount;
    restore_current_blog();
  }

  echo \'number of posts \'.$totalpostcount.\'<br>\';
  echo \'number of pages \'.$totalpagecount.\'<br>\';

function get_all_networks_posts($args){
   if(!$args){
      return false;
   }
   $sites = get_sites();
   $blog_posts = array();
   if($sites){
      foreach ($sites as $site) {
         switch_to_blog($site->id);
         $posts = get_posts($args);
         $blog_posts[$site->id] = $posts; // this is the above line
         //$blog_posts[] = $posts;If you do not need site ids then use this line removing just the above line
      }
   }
   restore_current_blog();
   if($blog_posts){
      return $blog_posts;
   }
}

// Print a demo
$args = arrat(
   \'post_type\' => \'post\',
   \'posts_per_page\' => -1,
);
print_r(get_all_networks_posts($args));

不久前，我编写了一个小的内部插件，用于在网络子网站上显示来自主站点（博客所在地）的帖子。此外，我只想在某个子网站上显示特定类别的帖子。

function custom_multiblog ( $atts ) {
    // Get current blog
    $original_blog_id = get_current_blog_id();

    // Setup a category for each blog id you want to loop through - EDIT
    if ( 19 == $original_blog_id ) {
        $catslug_per_blog_id = array( 1 => \'category1\', );
    } else if ( 22 == $original_blog_id ) {
        $catslug_per_blog_id = array( 1 => \'category2\', );
    } else if ( 23 == $original_blog_id ) {
        $catslug_per_blog_id = array( 1 => \'category3\', );
    } else {
        $catslug_per_blog_id = array( 1 => \'category1, category2, category3\', );
    }
    
    foreach( $catslug_per_blog_id as $bid => $catslug ) {
        //Switch to the blog with the blog id $bid
        switch_to_blog( $bid ); 
        $args = array(
            //\'post_type\' => \'post\',
            \'category_name\'  => $catslug,
            \'posts_per_page\' => 10,
        );
        $args[\'paged\'] = get_query_var( \'paged\' ) ? get_query_var( \'paged\' ) : 1;
        
        echo \'<div class="multiblog-wrapper">\';
            $query = new WP_Query( $args );

            while( $query->have_posts() ) : $query->the_post();
                echo \'<article class="multiblog-item">\';
                    echo \'<div class="multiblog-img"><a href="\' .get_the_permalink() . \'">\';
                    the_post_thumbnail (\'large\');
                    echo \'</a></div>\';
                    echo \'<div class="multiblog-content">\';
                        echo \'<h2 style="line-height: 1em;"><a href="\' .get_the_permalink() . \'">\' . get_the_title() . \'</a></h2>\';
                        echo \'<p>\' . get_the_excerpt() . \'</p>\';
                    echo \'</div>\';
                    echo \'<div class="clearfix"></div>\';
                echo \'</article>\';  
            endwhile;
        
        echo \'</div>\';
    }

    switch_to_blog( $original_blog_id ); 
    wp_reset_postdata();
    echo \'<div class="clearfix"></div>\';
    echo \'<div class="multiblog-navigation">\';
        previous_posts_link( \'<< newer\' );
        next_posts_link( \'older >>\', $query->max_num_pages );
    echo \'</div>\';

}
add_shortcode( \'multiblog\', \'jetzt_konf_multiblog\' );